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dc.contributor.authorMcGill, Peter
dc.contributor.authorSmith, Leigh C.
dc.contributor.authorEvans, N. Wyn
dc.contributor.authorBelokurov, Vasily
dc.contributor.authorLucas, Philip W.
dc.date.accessioned2019-08-14T09:35:05Z
dc.date.available2019-08-14T09:35:05Z
dc.date.issued2019-07
dc.identifier.citationMcGill , P , Smith , L C , Evans , N W , Belokurov , V & Lucas , P W 2019 , ' Ongoing astrometric microlensing events from VVV and Gaia ' , Monthly Notices of the Royal Astronomical Society , vol. 487 , no. 1 , pp. L7-L12 . https://doi.org/10.1093/mnrasl/slz073
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 17203126
dc.identifier.otherPURE UUID: 0903af7a-7c10-4aae-925d-a0ce8de25697
dc.identifier.otherArXiv: http://arxiv.org/abs/1905.08270v1
dc.identifier.otherORCID: /0000-0002-8872-4462/work/62748863
dc.identifier.otherScopus: 85084315506
dc.identifier.urihttp://hdl.handle.net/2299/21598
dc.description6 pages, 2 figures, accepted MNRAS Letters
dc.description.abstractWe extend predictive microlensing event searches using the Vista Variables in the Via Lactea survey and the second Gaia data release. We identify two events with maxima in 2019 that require urgent follow-up. First, we predict that the nearby M2 dwarf L 338-152 will align with a background source with a closest approach of $35^{+35}_{-23}$ mas on 2019 November $16^{+28}_{-27}$ d. This will cause a peak astrometric shift and photometric amplification of the background source of $2.7^{+3.5}_{-1.5}$ mas and $5.6^{+143.2}_{-5.2}$ mmag respectively. This event should be astrometrically detectable by both the Hubble Space Telescope (HST) and the Spectro-Polarimetric High-contrast Exoplanet Research instrument on the Very Large Telescope. Secondly, we predict the likely K dwarf NLTT 45128 will lens a background source with a closest approach of $105.3^{+12.2}_{-11.7}$ mas on 2019 September $26^{+15}_{-15}$ d. This will produce a peak astrometric shift of $0.329^{+0.065}_{-0.059}$ mas. NLTT 45128 is only 3.6 magnitudes brighter than the background source which makes it an excellent candidate for follow-up with HST. Characterisation of these signals will allow direct gravitational masses to be inferred for both L 338-152 and NLTT 45128 with an estimated precision of $\sim9$ and $\sim13$ per cent respectively.en
dc.format.extent6
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.rightsOpen
dc.subjectastro-ph.SR
dc.subjectastro-ph.IM
dc.titleOngoing astrometric microlensing events from VVV and Gaiaen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
dc.description.versiontypeFinal Published version
dcterms.dateAccepted2019-07
rioxxterms.versionAM
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnrasl/slz073
rioxxterms.licenseref.uriOther
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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